型材多道次热轧奥氏体演化三维有限元模拟  

3-D FEM simulation of austenite evolution in shape-metal multipass hot rolling

作　　者：贺庆强 孙佳 赵军友 闫成新 袁宝民 李翠翠 

机构地区：[1]中国石油大学机电工程学院,山东青岛266580 [2]青岛保税物流园区,山东青岛266555

出　　处：《中南大学学报（自然科学版）》2013年第11期4468-4473,共6页Journal of Central South University:Science and Technology

基　　金：山东省中青年科学家奖励基金资助项目(BS2011ZZ020);青岛市科技计划项目(13-1-4-257-JCH);中央高校基本科研业务费专项资金资助项目(12CX04062A)

摘　　要：为了优化型材多道次热轧工艺制度,研究工艺参数对轧件几何尺寸及微观组织演化的影响;在借鉴现有数学模型的基础上,通过热模拟实验和金相分析建立描述Q235奥氏体晶粒加热长大、再结晶、道次间隙晶粒长大以及流变应力的数学模型;并通过编写用户子程序将其耦合到某11道次H型钢热轧工艺过程的三维热力微观组织有限元分析中,获得整个轧制过程中轧件内应力、应变、温度以及奥氏体晶粒的演化情况。研究结果表明:现有H型钢粗轧工艺可以细化腹板处的奥氏体组织;不同变形条件下多道次累积塑性应变数值相同时奥氏体细化程度相当。In order to optimize the schedule of multi-pass hot rolling process of shape metal, effects of rolling parameters on the section size and microstructure evolution were investigated. Based on microstructure evolution equations available in literatures, a set of mathematic equations were reproduced to model the evolution of austenite grain size, recovery, static and dynamic recrystallisation and their effects on flow stress of materials. The equations were implemented into the commercial FE solver through subroutine programs for fully three dimensional thermo-mechanically coupled simulation of an eleven-pass hot rolling process, and then the distribution of stress, strain, temperature and the evolution of austenite grain size in cross section of beam blank were obtained. The simulation results show that the refined austenite grain mainly locates on the web of blank, and the grain is refined to a certain extent if the accumulated plastic strain under different rolling parameters is equivalent.

关 键 词：H型钢 多道次热轧 奥氏体演化 数值分析 

分 类 号：TG335[金属学及工艺—金属压力加工]